Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
  • F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
  • F04D7/04—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous
  • F04D7/045—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous with means for comminuting, mixing stirring or otherwise treating
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D13/00—Pumping installations or systems
  • F04D13/12—Combinations of two or more pumps
  • F04D13/14—Combinations of two or more pumps the pumps being all of centrifugal type
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D13/00—Pumping installations or systems
  • F04D13/16—Pumping installations or systems with storage reservoirs
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D29/00—Details, component parts, or accessories
  • F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
  • F04D29/708—Suction grids; Strainers; Dust separation; Cleaning specially for liquid pumps

Definitions

• the technical solution relates to a device for protection of pumps in communal wastewater pumping stations, those from industry, agriculture, rain water or drinking and raw water.
• the device for protection of wastewater pumps comprises the following:
• a separation chamber provided with a discharge pipe for returning wastewater to a sewerage network
• a supply pipe connected to a separation chamber, in order to supply solid particles containing wastewater to the separation chamber T
• a reversing valve arranged between a supply pipe and a separation chamber in order to prevent reversing flow of wastewater into the supply pipe
• a solid particles separator arranged between the separation chamber and the bidirectional pipe in order to separate solid particles contained in wastewater in the separation chamber
• the biderictional pipe and the discharge pipe are arranged so as to open into the separation chamber opposite each other in a lower part of the separation chamber. Instead, wastewater containing solid particles flowing through an inlet pipe into a wet accumulation chamber is directed to the separation chamber through a supply pipe. It further flows from the separation chamber through the solid particles separator via the biderictional pipe and through a pump into the wet accumulation chamber.
• the solid particles separator captures solid particles and thereby they accumulate in the separation chamber. Particles having higher dimensional weight (sand, gravel) than a pumped medium accumulate at the bottom of the separation chamber due to sedimentation and they do not pass further onto a pump impeller.
• a solid particle is understood to be a solid particle having dimensions exceeding a throughput rate of a pump impeller installed in a pumping station or a particle capable of causing abrasion of blades of the pump impeller. Sand, gravel as well as fabrics, hygienic tissues, foils of various types, clusters of various materials and the likes can form the solid particle.
• the separation chamber is shaped as a cylinder that may be arranged either vertically or horizontally.
• the separation chamber comprises an upper part, bottom and side wall/walls.
• the separation chamber further comprises openings for respective pipes.
• a bidirectional pipe and a discharge pipe are attached in a lower part of the separation chamber so that their orifices are situated opposite each other across the separation chamber.
• the lower part of the separation chamber is meant to be a space immediately above the bottom of the separation chamber.
• the supply pipe is situated so that it opens into the separation chamber on its top.
• the reversing valve may consist of for example a seat and a float ball. During pumping water pressure presses the float ball into the seat preventing backflow of wastewater.
• the discharge pipe directs from a side wall ofthe chamber first obliquely upward at an angle of 30° to 70° with respect to the bottom of the separation chamber, more preferably at an angle of 50° and then it is curved so that it is directed perpendicularly upward. It is an advantage of said embodiment that the pipe does not include a right angle and solid particles are discharged through the discharge pipe without any problems by water pressure.
• the bidirectional pipe is branched.
• One branch opens through a side wall into the lower part of the separation chamber, like in the previous case, and the other branch opens through the side wall into the upper part of the separation chamber.
• the upper part of the separation chamber is understood as a space of the separation chamber below the reversing valve.
• Both branches are attached to the separation chamber through an individual solid particles separator. Branching of the bidirectional pipe into two height levels results in enhancement of hydraulic characteristics in the separation chamber. After the pump is switched on, pressurised flow is partially directed through one branch of the bidirectional pipe to the upper part of the separation chamber and a part of the pressurised flow is directed through another branch of the bidirectional pipe to the lower part of the separation chamber.
• the supply pipe is in the form of an inlet channel. From a certain height walls of the inlet channel are provided with filtration perforations.
• the function of the channel is on one hand directing water into the separation chamber, but simultaneously also separation and filtration of storm sewage through perforations in the side walls of the channel.
• Size of perforations in the side walls of the channel is dimensioned according to the throughput rate of the pump impeller installed in the pumping station. Arrangement of perforations on the walls, their amount and design are determined by the value of the maximal critical inlet into the pumping station. Accordingly, an average daily flow is securely let into the separation chamber through the inlet channel and eventual critical flow is passed through the filtration perforation directly into the wet accumulation chamber in order to avoid flooding of the separation chamber. Filtration perforations prevent passing the solid particles of sizes greater than the throughput rate of the pump impeller into the accumulation chamber and said solid particles are passed through into the separation chamber by the channel.
• the accumulation chamber may comprise a plurality of pumps, in that case each pump is provided with a separate device according to the present solution. Said devices may, however, share one supply pipe or inlet channel.
• a sieve having opening sizes dimensioned according to the throughput rate of a pump impeller may be a solid particles separator.
• a disadvantage of the sieve is that it is quickly clogged, in particularly, when there are fabrics or disposable hygienic tissues and the like in wastewater. In addition, when wastewater is pumped reversely the separator is only partially washed as the said fabrics tend to enmesh into the sieve.
• a device may comprise a rod solid particles separator.
• the rod separator consists of a frame provided about the inner circumference with rods having at minimum two or three or more lengths.
• the frame may preferably be of an annular shape.
• the outer circumference of the grame may be of a square, rectangular or other geometric shape.
• Rods are arranged alternately (long, short, long, short) on the frame. Rods protrude radially from the body plane onto one side at an angle in such a manner that a surface that longitudally intersects all rods forms a truncated cone or truncated pyramid (frustum).
• Rods are arranged so that a space between two neighboring rods and at the same time space between free ends of any two long rods does not exceed the size the throughput rate of the pump impeller is dimensioned for.
• a distance between the rods is in the range of 15 to 100 mm.
• Rod length may be for example 20 and 50 mm, 20 and 60mm, 15 and 60mm, 20 and 80mm and the like. Length of the rods primarily depends on the throughput rate of the pump impeller.
• Said rod solid particles separator is positioned between a flange of the bidirectional pipe and a flange of the separation chamber in a way the rods are directed into the space of the separation chamber.
• the rod separator may be preferably provided with means for fastening in the flange e.g. in the form of openings.
• the rod separator may be preferably provided with at least one groove for mounting a sealing. Increasing of filtration surface of the solid particles separator resulting in lowering a risk of clotting the separator is an advantage of the rod design of the separator.
• the pump is commonly positioned at the bottom of the wet accumulation chamber and according to the present technical solution it may be attached to bidirectional pipe of the device by means of a dismountable coupling through a pipe of the pump.
• the discharge pump of the device may be connected by a dismountable coupling to the discharge pump of the pumping station. Lengths of individual pipes depend on a depth of the pumping station and a distance of the inlet pipe of wastewater from the bottom of the pumping station.
• the bidirectional pipes and the pipe of the pump as well as the discharge pipe and the discharge pipe of the pumping station are connected with dismountable couplings at the separation chamber proximity.
• the device according to the present technical solution provides for the pump not to come into contact with solid particles that cause its excessive wearing-off, clogging and breakdowns.
• the device according to the present technical solution provides a plurality of economic and ecological advantages, namely the device can be installed into wet chambers of new as well aj majority of existing pumping stations without a requirement of building modifications of the pumping stations. Accordingly, in majority cases the device requires no other than already existing space in the pumping station, nor further construction works. After installation, frequency of dispatching of operator’s maintenance workers to the pumping stations for pump cleaning, maintenance and repair purposes decreases, pump life increases, the need for handling the rakings is eliminated resulting in reduction of ecological burden of environment in the surrounding of the pumping station.
• Fig. 1 shows a configuration of the device according to the technical solution in a wet accumulation chamber of a pumping station.
• Fig. 2 shows the device according to the technical solution with a branched bidirectional pipe.
• Fig. 3 illustrates a design of a rod solid particles separator.
• Fig. 4 je shows a configuration of devices according to the technical solution in a wet accumulation chamber that contains two pumps and a supply pipe is in the form of an inlet channel.
• Fig. 1 shows a device for protection of wastewater pumps comprising separation chamber 4 substantially in the form of a perpendicularly positioned cylinder.
• Said separation chamber is provided in its lower part with discharge pipe 9 of the chamber that is further connected by a dismountable coupling onto discharge pipe 9J_ of a pumping station, that is further connected to sewerage network 1J_.
• the device further comprises supply pipe 2, connected to inlet pipe 1_.
• Supply pipe 2 is from another side connected from the top to separation chamber 4 to inlet wastewater into separation chamber 4.
• a reversing valve for preventing reverse flow of wastewater into supply pipe 2 is positioned between supply pipe 2 and separation chamber 4.
• Said valve consists of seat 3 arranged on supply pipe 2 and corresponding float ball 5 positioned in separation chamber 4.
• Bidirectional pipe 7 is connected on chamber 4 in the lower part of separation chamber 4_opposite the orifice of discharge pipe 9 of the chamber. Said bidirectional pipe 7 is connected to pump pipe 7J_ and connects the device with pump 1_0 positioned in wet accumulation chamber 8.
• Rod separator 6 of solid particles is arranged between separation chamber 4 and bidirectional pipe 7. The role of the rod separator 6 of solid particles is separating solid particles contained in wastewater in separation chamber 4.
• wastewater flows from separation chamber 4, through rod solid particles separator 6 via bidirectional pipe 7 into pump Q and consequently to wet accumulation chamber 8.
• Solid particles contained in wastewater are filtrated by solid particles separator 6 and are accumulated at the bottom of separation chamber 4.
• pump 10 is switched on.
• wastewater from wet accumulation chamber 8 is pumped back by pump IQ through bidirectional pipe 7 and rod solid particles separator 6 into separation chamber 4.
• An increasing level of pumped wastewater in separation chamber 4 presses float ball 5 onto seat 3, closing the inlet into supply pipe 2.
• Pumped waster continues further from separation chamber 4 into chamber discharge pipe 9 and further to pump station discharge pipe 9J_.
• Solid particles accumulated at the bottom of separation chamber 4 are also discharge from separation chamber 4 by pressure of pumped water into chamber discharge pipe 9 and through pump station discharge pipe 9J_ they are further transported into sewerage network V ⁇ _.
• Example 2 Example 2:
• Fig. 2 shows a preferred embodiment of the device for pump protection.
• the device comprises all parts of the device according to Example 1.
• the device differs from the device according to Example 1 in that bidirectional pipe 7 is branched.
• One branch opens into a lower part of separation chamber 4, as in Example 1
• another branch opens into an upper part of separation chamber 4. Both branches are connected to the separation chamber through a separate solid particles separator 6J_, 6 2.
• Example 3 Example 3:
• Fig. 3 shows a rod solid particles separator consisting of frame 12 of annular shape, where said ring is about its inner circumference provided with rods 13 and 14 of at least two lengths.
• the rods are on the frame, they are arranged alternately (long, short, long, short). Simultaneously, the rods radially protrude from the frame plane into one side at an angle in a way a plane intersecting their surfaces forms a truncated cone (frustum).
• the rods are arranged so that a space between any two rods does not exceed the size the throughput rate of the pump impeller is dimensioned for. In practice the distance between the rods is in the range of 15 to 100 mm.
• Example 4 Example 4:
• Figure 4 shows connection of the devices according to the present technical solution in a wet accumulation chamber containing two pumps.
• the devices are similar to the device described in Example 2.
• the devices differ from the device in Example 2 in that they comprise only one common supply pipe 2 in a form of a inlet channel.
• the inlet channel is connected to inlet pipe 1 From a certain height walls of the inlet channel are provided with filtration perforations. Size of the perforations is dimensioned according to the throughput rate of pump impeller 10 and 10’.
• Arrangement of perforations in the side walls of the inlet channel are determined by a value of the maximal critical inlet into the pumping station. Accordingly, the perforations are arranged in such height of the channel wall that an average daily flow is securely let in to separation chambers 4 and 4’ through the inlet channel and eventual critical flow is passed directly into wet accumulation chamber 8.

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• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Structures Of Non-Positive Displacement Pumps (AREA)
• Sewage (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (2)

Family

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Family Applications (1)

Country Status (8)

Families Citing this family (1)

• 2018
  • 2018-12-11 SI SI201830608T patent/SI3724508T1/sl unknown
  • 2018-12-11 HU HUE18842676A patent/HUE057804T2/hu unknown
  • 2018-12-11 PL PL18842676T patent/PL3724508T3/pl unknown
  • 2018-12-11 ES ES18842676T patent/ES2909173T3/es active Active
  • 2018-12-11 LT LTEPPCT/SK2018/050016T patent/LT3724508T/lt unknown
  • 2018-12-11 HR HRP20220366TT patent/HRP20220366T1/hr unknown
  • 2018-12-11 RS RS20220236A patent/RS63066B1/sr unknown
  • 2018-12-11 EP EP18842676.1A patent/EP3724508B1/de active Active

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